Clint Eastwood and Meryl Streep are shown in the 1995 film 'The Bridges of Madison County.' The book is about to become a Broadway musical. / Warner Bros./Associated Press

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There’s a new chapter in “The Bridges of Madison County.” The 1992 book that became a 1995 movie starring Clint Eastwood and Meryl Streep is heading to Broadway as a musical.

Producers said Thursday the show will debut in August at the Williamstown Theatre Festival in Massachusetts before moving in January to the Gerald Schoenfeld Theater in New York.

No casting was announced, but three Tony winners are at the helm: scriptwriter Marsha Norman (“ ’night, Mother”), songwriter Jason Robert Brown (“Parade”) and director Bartlett Sher (“The Light in the Piazza” and the revival of “South Pacific”).

Based on the best-seller by Robert James Waller, the story tells of a chance encounter between a National Geographic photographer and an Iowa farm wife. Their romance grows a lot faster than the surrounding corn.

“I just think it’s fantastic that this story still has legs,” Madison County Chamber of Commerce Executive Director Heather Riley said. “That book is — what, 20 years old? — and it’s become such a phenomenon.”

She said the delegation who visited Iowa officials this week from the state’s Chinese sister state, Hebei, asked specifically to see the Roseman Bridge. “You’d be surprised how many people wander in every day from all over the world,” she said.

Riley has traded emails with a marketing representative from the musical’s production company, who hopes to promote the show at the Covered Bridge Festival in October. The company may set up a booth or bring in a few of the stars — and then return to New York with Winterset swag for the show’s investors. One of the bigwigs already has a Madison County tote bag and apparently “just loves it,” Riley said. She laughed. “Oh, we can get ’em more bags. That’s easy.”

Word about the musical hasn’t spread much around town, but Cindy Stanbro of the Winterset Stage said she’d like to produce the show locally if the rights ever become available. “Absolutely,” she said. “It would only make sense.”